Surface thermodynamics and viscosity of 1-dimethylamino-2-propanol+1-(2-aminoethyl)piperazine and 1-dimethylamino-2-propanol+1,5-diamino-2-methylpentane aqueous solutions

The surface tensions (gamma) and viscosities (eta) of 1-dimethylamino-2-propanol (DMA2P) - 1-(2-aminoethyl) piperazine (AEP) and DMA2P - 1,5-diamino-2-methylpentane (DAMP) were measured and correlated. According to the CO2 capture temperature from the thermal power plant flue gas (around 313 K), the experimental temperatures were selected to be 303.2 K, 313.2 K and 323.2 K. The mass fractions of DMA2P ranged from 0.300 to 0.500, and those for activators (AEP and DAMP) ranged from 0.050 to 0.150. Temperature and composition dependences of gamma and eta were demonstrated on the basis of experiments and calculations. The activation energy (Ea) was estimated from the temperature dependence of viscosity. Analytical formulations of surface entropy (S-S) and surface enthalpy (H-S) were deduced from the analytical equation of gamma. S-S and H-S were calculated and their variations with respect to mass fraction were analyzed. (c) 2020 Elsevier Ltd.